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Scars of Mirrodin is an expansion pack released on October 1, 2010. It is the first expansion set of the Scars of Mirrodin block. Scars brought the new "infect" mechanic to magic. Creatures with the infect ability do damage in the form of -1/-1 counters to creatures, and poison counters to players. Additionally, the new keyword action "Proliferate" allows players to add an additional counter to any card or player that already has one.

Introduced game mechanics and abilities:

Infect: This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.

Proliferate: You choose any number of permanents and/or players with counters on them, then give them each another counter of a kind already there.